The incident occurred in Tank district bordering South Waziristan Agency.
The gun-battle erupted after the police raided the house of Bakht Jamal to arrest him at Umar village, police said. Jamal is a wanted proclaimed offender wanted in cases of murder and other illegal operations.
However, police said the accused instead of surrendering started firing at them. The police retaliated and a gun-battle ensued between the two.
Three policemen were killed and four others injured in the incident, police said.
The brother of proclaimed offender, Afzal was also killed during exchange of fire. However, Jamal escaped from the scene. Police have started a search operation for arrest of the killers.
